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Cystinosis is an inherited disease that if untreated, results in kidney failure as early as the first decade of life. The current marketed therapy is Cystagon® (cysteamine bitartrate) which must be taken every six hours for the rest of the patient's life to prevent complications of cystinosis. RP103 is a formulation of cysteamine bitartrate that is being studied to see if it may be able to be given less frequently, once every 12 hours, and have similar results to four times a day Cystagon®.

This is a long-term, open-label, study to determine the safety and tolerability of twice a day treatment with Cysteamine Bitartrate Delayed-release Capsules(RP103). It will involve 6-9 monthly clinic visits followed by quarterly clinic visits for the duration of the study and home use of RP103. Enrollment will be offered first to those patients who have completed the previous Phase 3 Study (RP103-03, NCT01000961) and won't be offered to others until data analysis of the RP103-03 subjects has been completed.

Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:

Child, Adult, Senior

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Male and female subjects must have completed the last visit of Study RP103-03 and be willing to continue with RP103 treatment.

OR for patients who did not complete the RP103-03 study:

Male and female subjects must have cystinosis.

Subjects must be on a stable dose of Cystagon® at least 21 days prior to Screening.

Within the last 6 months, no clinically significant change from normal in liver function tests[i.e., ALT, AST, total bilirubin] and renal function [i.e., estimated GFR] at Screening as determined by the Investigator.

Sexually active female subjects of childbearing potential (i.e., not surgically sterile [tubal ligation, hysterectomy, or bilateral oophorectomy] or at least 2 years naturally postmenopausal) must agree to utilize the same acceptable form of contraception from Screening through completion of the study.

Subjects must be willing and able to comply with the study restrictions and requirements.

Subjects or their parent or guardian must provide written informed consent and assent (where applicable) prior to participation in the study.

Exclusion Criteria:

Patients enrolled in the previous Study RP103-03 who did not complete their last scheduled Study visit or who do not wish to continue on treatment with RP103.

AND for patients who did not complete the RP103-03 study:

Subjects less than 1 year old

Subjects with a known history, currently of the following conditions or other health issues that make it, in the opinion of the investigator, unsafe for them to participate: inflammatory bowel disease (if currently active) or have had prior resection of small intestine; Heart disease (e.g., myocardial infarction, heart failure, unstable arrhythmias or poorly controlled hypertension) 90 days prior to Screening; Active bleeding disorder 90 days prior to Screening; Malignant disease within the last 2 years.

Patients with a hemoglobin level < 10 g/dL at Screening or a level that, in the opinion of the investigator, makes it unsafe for the subject to participate.

Subjects with known hypersensitivity to cysteamine or penicillamine.

Female subjects who are nursing, planning a pregnancy, known or suspected to be pregnant, or have a positive serum pregnancy screen.

Subjects who, in the opinion of the Investigator, are not able or willing to comply with the protocol.

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01197378